catec WSC11 User manual

Instructions for Use
021774/07/14
Weather Station Compact WSC11
4.9056.10.00x

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Safety Instructions
Before operating with or at the device/product, read through the operating instructions.
This manual contains instructions which should be followed on mounting, start-up, and operation.
A non-observance might cause:
- failure of important functions
- endangerment of persons by electrical or mechanical effect
- damage to objects
Mounting, electrical connection and wiring of the device/product must be carried out only by a qualified
technician who is familiar with and observes the engineering regulations, provisions and standards applicable in
each case.
Repairs and maintenance may only be carried out by trained staff or Adolf Thies GmbH & Co. KG. Only
components and spare parts supplied and/or recommended by Adolf Thies GmbH & Co. KG should be used
for repairs.
Electrical devices/products must be mounted and wired only in a voltage-free state.
Adolf Thies GmbH & Co KG guarantees proper functioning of the device/products provided that no
modifications have been made to the mechanics, electronics or software, and that the following points are
observed:
All information, warnings and instructions for use included in these operating instructions must be taken into
account and observed as this is essential to ensure trouble-free operation and a safe condition of the measuring
system / device / product.
The device / product is designed for a specific application as described in these operating instructions.
The device / product should be operated with the accessories and consumables supplied and/or recommended
by Adolf Thies GmbH & Co KG .
Recommendation: As it is possible that each measuring system / device / product may, under certain conditions,
and in rare cases, may also output erroneous measuring values, it is recommended using redundant systems
with plausibility checks for security-relevant applications.
Environment
As a longstanding manufacturer of sensors Adolf Thies GmbH & Co KG is committed to the
objectives of environmental protection and is therefore willing to take back all supplied
products governed by the provisions of "ElektroG" (German Electrical and Electronic
Equipment Act) and to perform environmentally compatible disposal and recycling. We are
prepared to take back all Thies products concerned free of charge if returned to Thies by our
customers carriage-paid.
Make sure you retain packaging for storage or transport of products. Should packaging
however no longer be required, please arrange for recycling as the packaging materials are
designed to be recycled.
Documentation
© Copyright Adolf Thies GmbH & Co KG, Göttingen / Germany
Although these operating instruction has been drawn up with due care, Adolf Thies GmbH & Co KG can accept
no liability whatsoever for any technical and typographical errors or omissions in this document that might
remain.
We can accept no liability whatsoever for any losses arising from the information contained in this document.
Subject to modification in terms of content.
The device / product should not be passed on without the/these operating instructions.

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Contents
1Device version...........................................................................................................................5
2Application.................................................................................................................................5
3Structure / Mode of operation....................................................................................................6
4Installation of COMPACT WSC11 Weather Station...................................................................8
4.1 Selection of installation site.................................................................................................8
4.2 Mechanical installation........................................................................................................9
4.2.1 Alignment to north.......................................................................................................10
4.3 Electrical installation..........................................................................................................11
4.3.1 Cable, cable preparation, connector installation..........................................................11
4.3.2 Diagram of connections..............................................................................................12
4.3.3 Connection using cable 509 584 / 509 585 (optional accessory).................................12
5Maintenance............................................................................................................................13
6Interface..................................................................................................................................14
6.1 Command interpreter THIES.............................................................................................14
6.1.1 Data telegrams...........................................................................................................15
6.2 Command interpreter MODBUS RTU................................................................................19
6.2.1 Measuring values (Input Register)..............................................................................20
6.2.2 Commands (Holding Register)....................................................................................24
6.3 Commands and description...............................................................................................25
6.3.1 Command AI...............................................................................................................25
6.3.2 Command BR.............................................................................................................26
6.3.3 Command CI ..............................................................................................................26
6.3.4 Command DC.............................................................................................................27
6.3.5 Command DO.............................................................................................................27
6.3.6 Command FB .............................................................................................................27
6.3.7 Command ID ..............................................................................................................27
6.3.8 Command KY.............................................................................................................28
6.3.9 Command LC .............................................................................................................28
6.3.10 Command RS..........................................................................................................29
6.3.11 Command SH..........................................................................................................29
6.3.12 Command SV..........................................................................................................30
6.3.13 Command TR..........................................................................................................30
6.3.14 Command TT ..........................................................................................................31
6.3.15 Command TZ ..........................................................................................................31
7LED signals.............................................................................................................................32
8Technical data.........................................................................................................................33
9Dimension drawing [in mm] .....................................................................................................36
10 Accessories (optional)..........................................................................................................37

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11 EC-Declaration of Conformity...............................................................................................38
Tables
Table 1 : Status word .....................................................................................................................16
Table 2 : Measured value telegram ................................................................................................18
Table 3 : Sensor data telegram ......................................................................................................19
Table 4 : MODBUS Frame .............................................................................................................19
Table 5: MODBUS Exceptions.......................................................................................................20
Table 6 : MODBUS Input Register..................................................................................................23
Table 7 : List of commands ............................................................................................................25
Figures
Figure 1 : LEDs..............................................................................................................................32
Figure 2 : Spectrum of brightness sensors.....................................................................................35
Figure 3 : Directional characteristics of brightness sensors............................................................35
Figure 4 : Spectrum for global irradiance sensor ............................................................................36
Instructions for use
These instructions for use describe all application and adjustment options for the device.
These detailed instructions allow users to modify the factory settings to their needs via the serial
interface of the Weather Station Compact WSC11.
Scope of supply
1 Weather Station Compact WSC11.
1 Copy of the instructions for uses.
For assisting the parameter settings and/or special configurations there is our cost-free Device Utility
Tool art.-no. 9.1700.81.000 available for you for download.
Please send a short e-mail to [e-mail], keyword “Utility Tool WSC 11” in the subject
heading, as well as your sender information and our order number / invoice number.
We will then let you have your log-in for the download.

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1 Device version
Designation
Order No.
Output
terminal
Data format
Operating voltage
WEATHER STATION
COMPACT WSC11
4.9056.10.000
1 x RS485
Data in ASCII format
(command interpreter:
THIES)
18...30V DC
18...28V AC
WETTERSTATION
COMPACT WSC11
4.9056.10.001
1 x RS485
Data in binary format
(command interpreter:
MODBUS RTU)
18...30V DC
18...28V AC
2 Application
The WEATHER STATION COMPACT WSC11 is designed for use in building services automation
systems (e.g. shade protection control). The WSC11 features the following measured variables:
Wind speed.
Wind direction.
4 x brightness (north / east / south / west).
Twilight.
Global irradiance.
Precipitation.
Air temperature.
Absolute air pressure.
Relative air pressure.
Time / date.
Geostationary data (local altitude, longitude and latitude).
Position of the sun (elevation / azimuth).
Relative air humidity.
Absolute humidity.
Dew-point temperature.
Inside temperature of housing.
The interface to the device is digital and consists of an RS485 interface in half-duplex mode. Together
with ID-based communications the interface allows the Weather Station to be operated in a bus. Two
data protocols are available:
ASCII (THIES- format).
Binary (MODBUS RTU).

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3 Structure / Mode of operation
Wind speed / wind direction:
Wind measurement is based on the hot wire principle. The underside of the housing is equipped with a
heated cylindrical sensor. A PID controller adjusts the temperature of the cylinder to a temperature that
is constantly increased in relation to the environment. The supplied heat energy is a measure of wind
speed.
The metal cylinder contains four temperature-measuring resistors. These resistors are thermally
coupled with the cylinder and positioned according to the 4 points of the compass. When an incident
flow affects the cylinder as a function of the wind direction, this is accompanied by a temperature
gradient which is registered by the measuring resistors. The relationships between the 4 temperature
values are used to calculate the wind direction.
In case the wind direction cannot be determined because the wind velocity is 0m/s, the value is set to
0. Wind from the north is displayed with 360°.
Brightness:
The brightness measurement is carried out via 4 Silicium photo sensors, which are aligned to the 4
cardinal directions in the mean elevation angle (40°).
Twilight:
Twilight means the light diffusion in the atmosphere, which arises with the smooth transition between
day and night before the beginning or after the end of day.
i.e., the solar disc is not visible.
The twilight is direction-independent.
It is calculated from the sum of the 4 measuring values of the direction-independent brightness
sensors.
A change to the mean value from the 4 brightness values is possible by command.
Global irradiance:
A silicon PIN photodiode is used to measure global irradiance. The sensor is positioned horizontally
and registers the diurnal values of the solar irradiation intensity.
Precipitation:
The detection of precipitation is based on capacitance measurement, i.e. the capacity of the sensor
surface varies when wet. The sensor is installed in the housing cover. An integrated heating system
adjusts the sensor area to an overtemperature in relation to the ambient temperature. This
overtemperature (approx. 2K) prevents bedewing of the sensor surface. The thermal output is
increased with precipitation. This accelerates drying of the sensor, allowing the time at which
precipitation ended to be identified more accurately.

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Air temperature:
A PT1000 measuring resistor is used to measure the air temperature. The sensor is mounted on a
flexible printed board and positioned in the lower section of the housing.
Air pressure:
Absolute air pressure is measured with a piezoresistive MEMS sensor.
To make a meaningful comparison between air pressure values simultaneously measured at different
locations, they need to be converted to a common datum (height above sea level). The calculation is
referred to the height above sea level (QNH) according to the international altitude formula (DIN
ISO2533).
Ph= air pressure at local altitude
Pb= air pressure at height above sea level
 = -0065K/m
gn= 9.80665m/s2
R = 287.05287m2/K/s2
Tb= 288.15K
The station height, required for the calculation, can be entered manually by the Command SH, or can
be determined automatically by GPS.
If you want to achieve an accuracy of 0.1hPa, referred to sea level, the local altitude (altitude of the
baro transmitter) must be given up to an accuracy of 0.8m.
Time / date and geostationary data:
The Weather Station has a GPS receiver with a built-in RTC. This allows it to receive the position of
the Weather Station (degree of longitude/latitude, local altitude) time (UTC) and date. The GPS
receiver does not need alignment.
The built-in RTC (Real Time Clock) is buffered with a backup capacitor and retains its data without a
voltage supply for a period of minimum 3 days.
Position of the sun (elevation / azimuth):
On the basis of the GPS data the current sun position is calculated every second.
Humidity measurement:
A built-in hygro-thermosensor is used to measure humidity levels. The sensor has a small air exchange
volume thanks to its compact design and responds to changes in humidity in seconds.
A software module uses the relative humidity and air temperature to calculate absolute humidity and
the dew-point temperature.
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Inside temperature of housing:
A silicon temperature sensor measures the temperature inside the housing.
GPS-Receiver:
The weather station has a GPS receiver with integrated RTC (Real Time Clock) for receiving the
position of the weather station, and time + date (UTC).
An alignment of the GPS receiver is not necessary.
The integrated RTC is buffered for a period of 3 days.
General information:
After activation of the WSC11 the first satellite data are available after approx. 2.5min.
When receiving the signals from one satellite: time with an accuracy of < 1µs.
When receiving the signals from three satellites: position with an accuracy of < 20m
When receiving the signals from four satellites: altitude, referred to the WGS84-
ellipsoid, with an accuracy < 30m
4 Installation of COMPACT WSC11 Weather Station
Please note:
The working position of the COMPACT WSC11 Weather Station is
horizontal (plug connection underneath).
During installation, de-installation, transport or maintenance of the
COMPACT WSC11 Weather Station make sure that no water gets
into the device and connector.
4.1 Selection of installation site
An exposed position should be selected for this site. Measurement properties should not be influenced
by light reflections, cast shadows or the device being positioned in the lee of the wind. Protection
against lightning and overvoltages should also be provided by the customer.

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4.2 Mechanical installation
The intended installation of the Weather Station WSC11 requires the use of a pipe socket / pipe
with an outside diameter of ≤25mm. The inside diameter must be ≥19mm to admit the
connector and cable.
Tool:
Hexagon socket wrench SW2mm
(socket wrench).
Procedure:
1. Push cable/plug connection
through the bore hole of the mast,
tube, bracket etc.
2. Put WSC11 on mast, tube.
3. Align WSC11 to “north”.
(Procedure see chapter 4.2.1).
4. Secure WSC11 by the M4-
hexagon socket screw.
Attention:
The hexagon
socket screw
is to be
tightened by
max. 0.6Nm.
When using the
mounting angel article no. 509276 (see
chapter accessories) the guide angles
must be removed, see fig.
The mounting angle is not included in
delivery.
Remark: Tube and mounting angle are not included in delivery.

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4.2.1 Alignment to north
For the exact determination of wind- and brightness direction the WEATHER STATION COMPACT
WSC11 must be mounted in north alignment (geographic north).
The hexagon socket screw serves as
north marking (N)
Tool:
Hexagon socket wrench SW2mm
(socket wrench).
Procedure:
1. Detect a prominent object in the
surrounding area (tree, building
etc.) in north direction by means of
a compass.
2. Via the north marking (N) and an
imaginary north-south axis the
weather station is to be located on
the prominent object.
3. Align weather station.
The north marking must indicate to
the geographic north.
4. In case of match the weather
station is to be secured by an M4-
hexagon socket screw.
Attention:
The hexagon socket
screw is to be tightened
by max. 0.6Nm.
Remark:
With the north alignment by means of a compass, the local variation (deviation in direction of a
compass needle from the true north direction) by interfering magnetic fields, and magnetic field
influences by hardware and electric cable are to be considered.

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4.3 Electrical installation
The COMPACT WSC11 Weather Station is equipped with a 7-pin plug for electrical connection. A
cable socket (mating connector) is included in the scope of supply.
4.3.1 Cable, cable preparation, connector installation
The cable to be used for connection should have the following properties:
5 cores, core cross-section max. 0.14mm², cable diameter max. 5.0mm, resistant to ultraviolet rays,
overall shielding.
Note:
A prepared connecting cable is available for the COMPACT WSC11 Weather Station
as an optional accessory.
Cable socket, type: Binder, series 711

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4.3.2 Diagram of connections
Order No.
4.9056.10.00x
View of
solder terminal
of mating connector
(cable socket)
2
4
6
3
5
1
7
* With long transmission paths connection to the GND of data acquisition may reduce their susceptibility to
interference.
Important:
* Do not connect DATA_GND to the supply voltage-GND.
4.3.3 Connection using cable 509 584 / 509 585 (optional accessory)
PIN
Core colour
Function
1
WHITE
NC
2
BROWN
* DATA _ GND
3
GREEN
DATA +
4
YELLOW
DATA -
5
GREY
NC
6
PINK
+ power 18...30V DC / 18...28V AC
7
BLUE
- power 18...30V DC / 18...28V AC
* With long transmission paths connection to the GND of data acquisition may reduce their susceptibility to
interference.
Important:
* Do not connect DATA_GND to the supply voltage-GND.
7 pol. Binder Steckverb. / Plug
7
Erde
Versorgung
DATA +
Earth
* DATA _ GND
Schirm / Shield
Power
18 ... 30 VDC
18 ... 28 VAC
DATA -
~~
NC NC
123456

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5 Maintenance
As the device does not have any moving parts, i.e. is not subject to wear during operation, only
minimal servicing is required.
Depending on the location the instrument might pollute. The cleaning should be carried out by means
of water and a soft cloth. Aggressive cleaning agents must not be used.
Please note:
During storage, installation, de-installation, transport or
maintenance of the COMPACT WSC11 Weather Station make sure
that no water gets into the device or connector.

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6 Interface
The interface to the Weather Station consists of a RS485 link (half-duplex mode), with the following
data format:
9600baud (the baud rate can be selected with the Command BR).
8data bits.
No parity.
1stop bit.
Data in ASCII format (command interpreter: THIES).
Data in binary format (command interpreter: MODBUS RTU).
The behavior (configuration) of the Weather Station can be changed using the available commands
(see Commands and description). For the command interpreter Thies-type the query of the
measuring values is carried out by the Command TR or resp. by the Command TT.
When the Weather Station starts up, the character string "Weather Station", software version,
hardware version and serial number is output:
Weather Station
v03.04
508990 v11-11
12030123
6.1 Command interpreter THIES
The Weather Station is equipped with a command interpreter of THIES-type, which can be used to
change the behaviour of the device. This allows you for example to adjust the averaging periods for
wind speed and wind direction. Commands basically have the following structure:
<id><command><CR> (No parameter: used to interrogate the selected
parameter).
<id><command><parameter><CR> (With parameter: used to set a new parameter).
id: identification number ("00" to "99")
command: command encompassing 2 characters (see list of commands)
parameter: parameter value with between 1 to 10 positions (decimal value in ASCII format)
<CR>: carriage return (13dec; 0x0D)
The 'id' identification number allows several devices to be operated together in a bus system. Every
device is assigned its own 'id' (see Command ID), and automatic telegram output is switched off (see
Command TT).
A transmitted command is acknowledged with an echo telegram. The echo telegram starts with a "!"
followed by the id, command and value selected. It ends with the characters "carriage return" and "new
line".
Commands can be transmitted with or without a parameter. If no parameter is specified, the set value
will be output.
Example: 00BR<CR>
!00BR00005<CR>

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If a command is transmitted with a parameter, the parameter is verified. If it is valid, it will be saved and
specified in the echo telegram. If the parameter is invalid, it will be disregarded and the set value
output in the echo telegram.
Examples:
00BR00005<CR> transmission command
!00BR00005<CR> echo telegram (parameter valid and password OK)
00BR00004<CR> transmission command
!00BR00005<CR> echo telegram (parameter valid but key incorrect)
Note:
The values measured by the sensor can be queried with the command
TR.
In this case the Weather Station does not respond with the echo
telegram, but with the requested data telegram!
To avoid any unintentional change in parameters, some commands (see list of commands) are
protected with a password. This password must be transmitted before the actual command.
Example: Change baud rate
00KY234<CR> Release commands of user level
00BR4<CR> Set baud rate to 4800
!00BR00004<CR> Baud rate set to 4800
The Weather Station supports 3 different password levels.
User level (password: "234").
Calibration data level.
Administrator level.
Please note:
Password-protected commands are released as long as one of the
following conditions is satisfied:
- the supply voltage is switched
- command 00KY0<CR> is transmitted
- no new command is transmitted for min. 120s.
6.1.1 Data telegrams
Data output takes place in response to a request with the command TR. You can chose between the
following telegrams:
Measured value telegram (parameter=1).
Sensor data telegram (parameter=2).
Calculation of the checksum, the composition of the status word and the control characters/separators
used in the telegrams are described below.

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Control characters:
CR –Carriage return (13dec; 0x0D)
LF –Line feed (10dec; 0x0A)
STX –Start of text (2dec; 0x02)
ETX –End of text (3dec; 0x03)
Separators:
The semicolon ';' is used as the separator between the individual measured values in the string.
The checksum separator is the multiplication sign '*'.
Checksum:
The checksum is the XOR link of all characters between <STX> and the byte <*>.
The asterisk acts as the separator from the checksum and is no longer included in the checksum.
Status:
The Weather Station includes a status word (32-bit) which supplies information about the status of the
Weather Station. The measured values undergo a plausibility check and are shown in the status word.
Bit number
Function
Description
Bit 0
Precipitation sensor
=1, bedewing protection active.
Bit 1
Precipitation sensor
=1, drying phase of sensor surface.
Bit 2
GPS data
=1, no valid RMC telegram received.
Bit 3
RTC data from GPS
receiver
=1, time from GPS receiver invalid.
Bit 4
ADC values
=1, values from analog-digital-converter invalid.
Bit 5
Air pressure
=1, measured value from air pressure sensor invalid.
Bit 6
Brightness north
=1, measured value from brightness sensor north invalid.
Bit 7
Brightness east
=1, measured value from brightness sensor east invalid.
Bit 8
Brightness south
=1, measured value from brightness sensor south invalid.
Bit 9
Brightness west
=1, measured value from brightness sensor west invalid.
Bit 10
Twilight
=1, measured value for twilight invalid.
Bit 11
Global irradiance
=1, measured value from global irradiance sensor invalid.
Bit 12
Air temperature
=1, measured value from air temperature sensor invalid.
Bit 13
Precipitation
=1, measured value from precipitation sensor invalid.
Bit 14
Wind speed
=1, measured value from wind speed sensor invalid.
Bit 15
Wind direction
=1, measured value from wind direction sensor is invalid.
Bit 16
Humidity sensor
=1, Readings from the humidity sensor invalid (relative humidity,
absolute humidity, dew point temperature).
Bit 17
Watchdog Reset
=1, letzter Neustart durch Watchdog-Reset.
Bit 18
EEPROM Parameters
=1, internal EEPROM parameters invalid.
Bit 19
EEPROM Parameters
=1, internal EEPROM parameters contain the Standard-values.
Bit 20
New FW
=1, last restart was carried out with new firmware.
Table 1 : Status word

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6.1.1.1 Measured value telegram
The Weather Station responds to the command "00TR1\r" with the measured value telegram. The
telegram structure is given in the following table:
Position
Length
Example
Description
1
1
<STX>
Start of text characters (0x02).
2
3
WSC
Designates theWSC11 weather station.
5
1
;
Semicolon.
6
2
##
Identification number of weather station.
8
1
;
Semicolon.
9
19
dd.mm.yyyy
hh:mm:ss
Date and time separated with a blank character
dd: day, mm: month, yyyy: year, hh: hour, mm: minute, ss: second.
28
1
;
Semicolon.
29
6
######
Specifies time format:
UTC
CEST
CET
UTC+xh
35
1
;
Semicolon.
36
5
###.#
Brightness north (kLux).
41
1
;
Semicolon.
42
5
###.#
Brightness east (kLux).
47
1
;
Semicolon.
48
5
###.#
Brightness south (kLux).
53
1
;
Semicolon.
54
5
###.#
Brightness west (kLux).
59
1
;
Semicolon.
60
3
###
Twilight (Lux).
63
1
;
Semicolon.
64
4
####
Global irradiance (W/m2).
68
1
;
Semicolon.
69
5
###.#
Air temperature (°C).
74
1
;
Semicolon.
75
1
#
Precipitation status (0: no precipitation, 1: precipitation).
76
1
;
Semicolon.
77
4
##.#
Average1wind speed (m/s).
81
1
;
Semicolon.
82
3
###
Average1wind direction (°).
85
1
;
Semicolon.
86
6
####.#
Absolute air pressure (hPa).
92
1
;
Semicolon.
93
6
####.#
Relative air pressure (hPa), referred to height above sea level.
99
1
;
Semicolon.
100
5
###.#
Inside temperature of housing (°C).
105
1
;
Semicolon.
106
5
###.#
Relative humidity (% r.h.).
111
1
;
Semicolon.
112
6
###.##
Absolute humidity (g/m³).
118
1
;
Semicolon.
119
5
###.#
Dew-point temperature (°C).
124
1
;
Semicolon.

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125
11
####.######
Degree of longitude (°) (GPS position)
Positive sign for longitude in eastern direction.
Negative sign for longitude in western direction.
135
1
;
Semicolon.
136
1
##.######
Degree of latitude (°) (GPS position).
137
10
###.######
Latitude (°) (GPS position).
Positive sign for latitude in northern direction.
Negative sign for latitude in southern direction.
147
1
;
Semicolon.
148
5
###.#
Position of the sun, elevation or resp. elevation angle (°).
On sunrise and sunset elevation equals 0°.
Between these distinctive points (i.e. intraday) the elevation takes
positive values.
153
1
;
Semicolon.
154
5
###.#
Position of the sun, azimuth or resp. geographic direction (°).
The azimuth is counted positively from the north to the south.
0° = north ; 180° = south.
159
1
;
Semicolon.
160
8
########
32-bit sensor status in hexadecimal format (0000 –FFFFFFFF).
168
1
*
Asterisk as separator for checksum.
169
2
##
8-bit checksum in hexadecimal format (00 –FF). The checksum is
calculated from the exclusive OR link of all characters after STX to the
character before "*".
171
1
<ETX>
End of text characters (0x03).
172
1
<CR>
Carriage return (0x0D).
173
1
<LF>
Line feed (0x0A).
Table 2 : Measured value telegram
1: The averaging interval is selected with the Command AI.
Measured values
The measured values are 1-second average values, with the exception of wind speed and wind
direction.
If the specified measuring range is exceeded (see Technical data), the measured value is limited to
the maximum (terminal value of measuring range) and the relevant bit set in the status (see table 1:
Status world).
Bit 16
Humidity sensor
=1, Readings from the humidity sensor invalid (relative humidity,
absolute humidity, dew point temperature).
Bit 17
Watchdog Reset
=1, letzter Neustart durch Watchdog-Reset.
Bit 18
EEPROM Parameters
=1, internal EEPROM parameters invalid.
Bit 19
EEPROM Parameters
=1, internal EEPROM parameters contain the Standard-values.
Bit 20
New FW
=1, last restart was carried out with new firmware.
Table 1 : Status word

19 - 40 021774/07/14
6.1.1.2 Sensor data telegram
The Weather Station responds to the command "00TR2\r" with the sensor data telegram. The telegram
structure is given in the following table:
Position
Length
Example
Description
1
1
<STX> 0x02
Start of text characters.
2
10
##########
Serial number.
12
1
;
Semicolon.
13
5
##-##
HW version (e.g. 06-11).
18
1
;
Semicolon.
19
5
##.##
SW version (e.g. 01.00).
24
1
;
Semicolon.
25
6
####.#
Height of Weather Station referred to height above sea level in
metres, derived from the GPS data (Geoid Model).
31
1
*
Asterisk as separator for the checksum.
32
2
##
8-bit checksum in hexadecimal format (00 –FF). The checksum is
calculated from the exclusive OR link of all characters after STX to
the character before "*".
34
1
<ETX> 0x03
End of text characters.
35
1
<CR> 0x0D
Carriage return.
36
1
<LF> 0x0A
Line feed.
Table 3 : Sensor data telegram
6.2 Command interpreter MODBUS RTU
Once the command interpreter is selected the transmitted bytes are interpreted according to the
MODBUS specification (http://www.modbus.org/). Here, the weather station WSC11 is representing a
MODBUS Slave.
The data transmission is carried out in packages, so-called frames, of maximum 256 bytes. Each
package contains a 16bit CRC checksum (initial value: 0xffff).
Slave-Address
Function code
Data
CRC
1byte
1byte
0...252byte(s)
2bytes
CRC low-byte
CRC high-byte
Table 4 : MODBUS Frame
The following MODBUS functions are supported:
- 0x04 (Read Input Register).
- 0x03 (Read Holding Registers).
- 0x06 (Write Single Register).
- 0x10 (Write Multiple Registers).
The weather station WSC11 supports a write access for the slave-address 0 (“Broadcast”).
All received MODBUS request are checked for validity before carrying out. In error case the weather
station responds with one of the following exceptions (MODBUS Exception Responses).

20 - 40 021774/07/14
Code
Name
Signification
0x01
ILLEGAL FUNCTION
The function code in the request is not allowed for the
register address.
0x02
ILLEGAL DATA ADDRESS
The register address in the request is not valid.
0x03
ILLEGAL DATA VALUE
The stated data in the request are not allowed.
Table 5: MODBUS Exceptions
6.2.1 Measuring values (Input Register)
All measuring values of the weather station WSC11 consume 32Bit, i.e. 2 MODBUS register
addresses. The following table shows the allocation of measuring value to register address, while the
measuring values are sorted as follows:
- By measuring value type (30001 to 34999).
- In unbroken sequence (35001 to 39999).
Register
address
Parameter Name
Unit
Multiplicator
Explanation
Data
type
30001
Wind speed
m/s
10
value / 10
(1 decimal place, e.g. 101=10.1m/s)
U32
30003
Mean value
Wind speed
m/s
10
value / 10
(1 decimal place, e.g.. 101=10.1m/s)
U32
30201
Wind direction
°
10
value/ 10
(1 decimal place, e.g. 1010=101.0°)
U32
30203
Mean value
Wind direction
°
10
value / 10
(1 decimal place, e.g. 1010=101.0°)
U32
30401
Air temperature
°C
10
value / 10
(1 decimal place, e.g.
255=25.5°C)
S32
30403
Interior temperature of
housing
°C
10
value / 10
(1 decimal place, e.g.
355=35.5°C)
S32
30601
relative humidity
%r.h.
10
value/ 10
(1 decimal place, e.g. 355=35.5°r.F.)
U32
30603
absolute humidity
g/m³
100
value / 100
(2 decimal places, e.g.
923=9.23g/m^3)
U32
30605
Dew point temperature
°C
10
value / 10
(1 decimal place, e.g.
115=11.5°C)
S32
30801
Absolute air pressure
hPa
100
value / 100
(2 decimal places, e.g.
105000=1050.00hPa)
U32
30803
Relative air pressure
relating to NHN
hPa
100
value / 100
(2 decimal places, e.g.
105000=1050.00hPa)
U32